Which of the following is an example of the effects of friction?
I. Worn-out shoes
II. Worn-out steps of foot bridges at railway stations
Show answer & explanation
Correct answer: C
Explanation
Correct Answer:
Option 3: Both I and II
Explanation:
Friction is a force that opposes motion when two surfaces come into contact. Due to friction, surfaces gradually wear out over time. Worn-out shoes and worn-out steps at railway stations are both examples of the effects of friction. Continuous rubbing causes damage to surfaces, which is commonly observed in daily life.
Additional Facts:
Option 1: Only I is incorrect because the second example is also valid.
Option 2: Only II is incorrect because the first example is also valid.
Option 4: Neither is incorrect because both are correct.
Probable Exam Questions:
Q: What type of force is friction?
A: Contact force
Q: One advantage of friction?
A: Helps in walking
Q: One disadvantage of friction?
A: Loss of energy
Q: What is used to reduce friction?
A: Lubricants